I found the solution (workaround).
The simplest way to avoid this is not to use indicators panel at all.
I added 'System tray' to xfce panel and now everything works fine.
I have Bluebird theme and nm-applet icon at usual place.
There is no hi cpu usage.
Background of system tray corresponds to sys
The same story.
15% CPU, xubuntu 16.04.1
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https://bugs.launchpad.net/bugs/1583164
Title:
Panel Indicator uses 25% cpu
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screenshot of top cmd:
** Attachment added: "Снимок экрана_2016-09-20_23-48-51.png"
https://bugs.launchpad.net/ubuntu/+source/xfce4-indicator-plugin/+bug/1583164/+attachment/4744547/+files/%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0_2016-09-20_23-48-51.png
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